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Journal of Clinical Microbiology, May 2005, p. 2118-2124, Vol. 43, No. 5
0095-1137/05/$08.00+0     doi:10.1128/JCM.43.5.2118-2124.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Dissemination of Community-Acquired Methicillin-Resistant Staphylococcus aureus Clones in Northern Norway: Sequence Types 8 and 80 Predominate

Anne-Merethe Hanssen,1* Aina Fossum,2 Jarle Mikalsen,1 Dag S. Halvorsen,3 Geir Bukholm,2 and Johanna U. Ericson Sollid1*

Department for Microbiology and Virology, Institute of Medical Biology, University of Tromsø, Tromsø, Norway,1 Department of Molecular Biology, Epi-Gen, Akershus University Hospital, Oslo, Norway,2 Department of Microbiology, University Hospital of North-Norway, Tromsø, Norway3

Received 11 August 2004/ Returned for modification 2 November 2004/ Accepted 30 December 2004

Increasing frequencies of community-acquired methicillin-resistant Staphylcoccus aureus (MRSA) strain isolation have been reported from many countries. The overall prevalence of MRSA in Norway is still very low. MRSA isolates (n = 67) detected between 1995 and 2003 in northern Norway were analyzed by pulsed-field gel electrophoresis, multilocus sequence typing, and staphylococcal cassette chromosome mec (SCCmec) typing. Sixty-seven isolates were associated with 13 different sequence types. Two successful MRSA clones predominated. Sequence type 8 (ST8) (40%) and ST80 (19%) containing SCCmec type IV were detected in hospitals and communities in different geographic regions during a 7-year period. In general, there was a low level of antimicrobial resistance. Only 26% of the isolates were multiresistant. International epidemic clones were detected. The frequent findings of SCCmec type IV (91%) along with heterogeneous genetic backgrounds suggest a horizontal spread of SCCmec type IV among staphylococcal strains in parallel with the clonal spread of successful MRSA strains.

* Corresponding author: Mailing address for Anne-Merethe Hanssen: Department for Microbiology and Virology, Faculty of Medicine, Institute of Medical Biology, University of Tromsø, N-9037 Tromsø, Norway. Phone: 47 77 64 57 52. Fax: 47 77 64 53 50. E-mail: annemh{at}fagmed.uit.no. Mailing address for Johanna U. Ericson Sollid: Department for Microbiology and Virology, Faculty of Medicine, Institute of Medical Biology, University of Tromsø, N-9037 Tromsø, Norway. Phone: 47 77 64 46 63. Fax: 47 77 64 53 50. E-mail: johanna.e.sollid{at}fagmed.uit.no.

Journal of Clinical Microbiology, May 2005, p. 2118-2124, Vol. 43, No. 5
0095-1137/05/$08.00+0     doi:10.1128/JCM.43.5.2118-2124.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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